Facing an error when generating schema for Neo4j

[ksbalajee]

I'm trying to use graphql-mesh with an existing neo4j database running on local and I'm not sure what to do for the following issue. The issue seems like the lack of support from the underlying neo4j-graphql-js library for this kind of complex relationship. I'm using Neo4j Version 3.5.25 Community Edition
Logs:

kbalajee@ATH57176:/c/dev/trinity/mesh$ npx graphql-mesh serve
🕸️ =>   ⠋ Generating Mesh schema...Initializing your Neo4j Schema
This may take a few moments depending on the size of your DB
🕸️ =>   ⠏ Generating Mesh schema...RelID :`Defines` for label set Subroutine has > 1 origin type (File,PerlFile); skipping
RelID :`Exports` for label set Subroutine has > 1 origin type (File,PerlFile); skipping
RelID :`Imports` for label set File,PerlFile has > 1 target type (File,PerlFile); skipping
RelID :`Imports` for label set File,TapTestFile has > 1 target type (File,PerlFile); skipping
RelID :`Imports` for label set EspFile,File has > 1 target type (File,PerlFile); skipping
RelID :`Imports` for label set File,PerlScriptFile has > 1 target type (File,PerlFile); skipping
RelID :`Imports` for label set File,UTestFile has > 1 target type (File,PerlFile); skipping
Relationship Neo4jRelationship {
  id: ':`Imports`',    
  type: 'relationship',
  properties: {},
  relType: 'Imports',
  links: [
    { from: [Array], to: [Array] },
    { from: [Array], to: [Array] },
    { from: [Array], to: [Array] },
    { from: [Array], to: [Array] },
    { from: [Array], to: [Array] }
  ]
} is not univalent and is not yet supported
🕸️ =>   ✖ Unable to start GraphQL Mesh: Body must be a string. Received: { typeDefs: "type Subroutine {\n   _id: Long!\n   endLine: String!\n   id: String!\n   name: String!\n   startLine: String!\n   calls: [Su
broutine] @relation(name: \"Calls\", direction: OUT)\n}\n\ntype File_PerlFile {\n   _id: Long!\n   fileName: String!\n   id: String!\n   packageName: String!\n   defines: [Subroutine] @relation(name: \"Defines\", direction: OUT)\n   exports: [Subroutine] @relation(name: \"Exports\", direction: OUT)\n}\n\ntype File_TapTestFile {\n   _id: Long!\n   fileName: String!\n   id: String!\n   packageName: String!\n}\n\ntype EspFile_File {\n   _id: Long!\n   fileName: String!\n   id: String!\n   packageName: String!\n}\n\ntype File_PerlScriptFile {\n   _id: Long!\n   fileName: String!\n   id: String!\n   packageName: String!\n}\n\ntype File_UTestFile {\n   _id: Long!\n   fileName: String!\n   id: String!\n   packageName: String!\n}\n\ntype File_IncFile {\n   _id: Long!\n   fileName: String!\n   id: String!\n   packageName: String!\n}\n\ntype 
Metadata {\n   _id: Long!\n   branch: String!\n   espNodes: String!\n   id: String!\n   lastRefresh: String!\n   perlNodes: String!\n   subroutines: String!\n}\n\n\n\n\n\n\n", resolvers: {} }.
npm ERR! code 1
npm ERR! path /c/dev/trinity/mesh
npm ERR! command failed
npm ERR! command sh -c graphql-mesh serve

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/kbalajee/.npm/_logs/2021-07-24T06_10_09_799Z-debug.log

.meshrc.yaml:

sources:
  - name: Neo4j
      handler:
        neo4j:
          url: bolt://localhost:7687
          username: neo4j
          password: test

[ksbalajee]

I was able to make a workaround. I used the underlying neo4j-graphql-js library and defined the typeDef myself and spun up an apollo server as mentioned in the readme over here and used that as a source in graphql-mesh.

.meshrc.yaml:

  sources:
   - name: Neo4j GraphQLApi
       handler:
         graphql:
           endpoint: http://localhost:3003/graphql

neo4j-graphql.js

const typeDefs = `
type File {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    exportedSubroutines: [Subroutine] @relation(name: "Exports", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedByFiles: [File] @relation(name: "Imports", direction: IN)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
    importedByPerlFiles: [PerlFile] @relation(name: "Imports", direction: IN)
    importedByPerlScriptFiles: [PerlScriptFile] @relation(name: "Imports", direction: IN)
    importedByIncFiles: [IncFile] @relation(name: "Imports", direction: IN)
    importedByTapTestFiles: [TapTestFile] @relation(name: "Imports", direction: IN)
    importedByUTestFiles: [UTestFile] @relation(name: "Imports", direction: IN)
    importedByEspFiles: [EspFile] @relation(name: "Imports", direction: IN)
}
type PerlFile {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    exportedSubroutines: [Subroutine] @relation(name: "Exports", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedByFiles: [File] @relation(name: "Imports", direction: IN)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
    importedByPerlFiles: [PerlFile] @relation(name: "Imports", direction: IN)
    importedByPerlScriptFiles: [PerlScriptFile] @relation(name: "Imports", direction: IN)
    importedByIncFiles: [IncFile] @relation(name: "Imports", direction: IN)
    importedByTapTestFiles: [TapTestFile] @relation(name: "Imports", direction: IN)
    importedByUTestFiles: [UTestFile] @relation(name: "Imports", direction: IN)
    importedByEspFiles: [EspFile] @relation(name: "Imports", direction: IN)
}
type PerlScriptFile {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
}
type EspFile {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
}
type IncFile {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
}
type TapTestFile {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    definedInFiles: [Subroutine] @relation(name: "Defines", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
}
type UTestFile {
    id: String
    fileName: String
    packageName: String
    definedSubroutines: [Subroutine] @relation(name: "Defines", direction: OUT)
    importedSubroutines: [Subroutine] @relation(name: "Imports", direction: OUT)
    importedFiles: [File] @relation(name: "Imports", direction: OUT)
    importedPerlFiles: [PerlFile] @relation(name: "Imports", direction: OUT)
}
type Subroutine {
    id: String
    name: String
    startLine: String
    endLine: String
    calls: [Subroutine] @relation(name: "Calls", direction: OUT)
    calledBy: [Subroutine] @relation(name: "Calls", direction: IN)
    definedByEspFiles: [EspFile] @relation(name: "Defines", direction: IN)
    importedByEspFiles:  [EspFile] @relation(name: "Imports", direction: IN)
    definedByPerlScriptFiles: [PerlScriptFile] @relation(name: "Defines", direction: IN)
    importedByPerlScriptFiles: [PerlScriptFile] @relation(name: "Imports", direction: IN)
    definedByTapTestFiles: [TapTestFile] @relation(name: "Defines", direction: IN)
    importedByTapTestFiles: [TapTestFile] @relation(name: "Imports", direction: IN)
    definedByUTestFiles: [UTestFile] @relation(name: "Defines", direction: IN)
    importedByUTestFiles: [UTestFile] @relation(name: "Imports", direction: IN)
    definedByIncFiles: [IncFile] @relation(name: "Defines", direction: IN)
    importedByIncFiles: [IncFile] @relation(name: "Imports", direction: IN)
    definedByFiles: [File] @relation(name: "Defines", direction: IN)
    importedByFiles: [File] @relation(name: "Imports", direction: IN)
    exportedByFiles: [File] @relation(name: "Exports", direction: IN)
    definedByPerlFiles: [PerlFile] @relation(name: "Defines", direction: IN)
    importedByPerlFiles: [PerlFile] @relation(name: "Imports", direction: IN)
    exportedByPerlFiles: [PerlFile] @relation(name: "Exports", direction: IN)
}
type Metadata {
    perlNodes: String,
    id: String,
    subroutines: String,
    lastRefresh: String,
    branch: String,
    espNodes: String
}
`;

import { makeAugmentedSchema } from 'neo4j-graphql-js';
import * as neo4j from 'neo4j-driver';


const schema = makeAugmentedSchema({ typeDefs });

const driver = neo4j.driver(
  'bolt://localhost:7687',
  neo4j.auth.basic('neo4j', 'test')
);

import { ApolloServer } from 'apollo-server';

const server = new ApolloServer({ schema, context: { driver } });

server.listen(3003, '0.0.0.0').then(({ url }) => {
  console.log(`GraphQL API ready at ${url}`);
});